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/usr/x86_64-linux-gnux32/include/bits/endian.h is in libc6-dev-x32-cross 2.27-3ubuntu1cross1.

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/* i386/x86_64 are little-endian.  */

#ifndef _ENDIAN_H
# error "Never use <bits/endian.h> directly; include <endian.h> instead."
#endif

#define __BYTE_ORDER __LITTLE_ENDIAN